Start stdin

crates/shared/src/syscall.rs

@@ -7,6 +7,7 @@ use crate::fs::File;
 
 #[repr(u64)]
 pub enum SysCall {
+    Read = 0,
     Write = 1,
     Open = 2,
     Seek = 8,
@@ -22,6 +23,7 @@ pub enum SysCall {
 impl From<u64> for SysCall {
     fn from(value: u64) -> Self {
         match value {
+            0 => SysCall::Read,
             1 => SysCall::Write,
             2 => SysCall::Open,
             8 => SysCall::Seek,
@@ -151,6 +153,13 @@ pub fn write(file: &mut File, buf: &[u8]) {
         syscall!(SysCall::Write, file.as_fd(), ptr as u64, size as u64);
     }
 }
+pub fn read(file: &mut File, buf: &mut [u8]) {
+    unsafe {
+        let ptr = buf.as_ptr();
+        let size = buf.len();
+        syscall!(SysCall::Read, file.as_fd(), ptr as u64, size as u64);
+    }
+}
 pub fn seek(file: &mut File, seek: SeekFrom) {
     unsafe {
         let (discriminant, value) = match seek {